Fix to call get_reserved_mem only once in VPD runtime
Fix to call get_reserved_mem only once in VPD runtime

Change-Id: I9d00b2d2f613dcb090794ecead9ef01184b54f24
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/19577
Tested-by: Jenkins Server
Tested-by: Jenkins OP Build CI
Tested-by: Jenkins OP HW
Reviewed-by: Martin Gloff <df0a4963746ae04ab678d064fccc7ee68adfd751@us.ibm.com>
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

csmart/hostboot,alvintpwang/hostboot,open-power/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,csmart/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,csmart/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,csmart/hostboot,alvintpwang/hostboot